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jolly up is a verb meaning "cause (somebody) to feel happier or more cheerful". It carries one recorded sense.
cause (somebody) to feel happier or more cheerful
“She tried to cheer up the disappointed child when he failed to win the spelling bee”
Definitions, synonyms and semantic relations for jolly up come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.